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    <title>Favorite Icon Toggler</title>
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    <main>
      <h1>Some Certificates</h1>
      <ul class="item-list">
        <li>CET-4 
          <button class="favorite-icon">&#9825;</button>
        </li>
        <li>CET-6 
          <button class="favorite-icon">&#9825;</button>
        </li>
        <li>NCRE-2 
          <button class="favorite-icon">&#9825;</button>
        </li>
      </ul>
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